<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>02_相对定位</title>
    <style>
        .fu{
            background-color: #ffff00;
        }
        .fu>div{
            width: 100px;
            height: 100px;
        }
        .z1{background-color: red}
        .z2{background-color: green}
        .z3{background-color: blue}
    </style>
</head>
<body>
<div class="fu">
    <div class="z1"></div>
    <div class="z2"></div>
    <div class="z3"></div>
</div>
</body>
</html>